Because we're an authorised installer for all three, the decision comes down to your project — not our supplier agreement. The starting point is always a heat pump hydronic heating heat-loss calculation, then we weigh four things:
1. Climate. Mild Sydney and Brisbane loads suit any of the three; cold Canberra, Blue Mountains and the Melbourne fringe push us toward the −25 °C-rated Maxa i-290 or the Immergas hybrid. See the local data on our Canberra and Melbourne pages.
2. New build vs retrofit. New builds get the all-in-one Maxa; retrofits onto existing radiators or underfloor often go to Immergas Magis for its drop-in compatibility.
3. Hot water priority. If efficient domestic hot water is the main driver, the Viessmann Vitocal is hard to beat — see our domestic & commercial hot water options.
4. Future-proofing. For clients who want the lowest-GWP refrigerant and longest regulatory runway, R290 (Maxa i-290, Viessmann Vitocal) wins over R32.
For the full cost, COP and brand breakdown, read our guide to heat pump hydronic heating in Australia.
